n-Type core effect on perylene diimide based acceptors for panchromatic fullerene-free organic solar cells

Eom, Seung Hun; Kim, Hee Su; Jin, Hee; Lee, Un Hak; Wibowo, Febrian Tri Adhi; Hwang, Dae‐Youn; Yoon, Sung Cheol; Jung, In Hwan

doi:10.1016/j.dyepig.2018.04.018

Cited by 13 publications

(4 citation statements)

References 56 publications

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“…Monomer 5 was synthesized via the lithiation–stannylation reaction using 1,6-bis(thiophen-2-ylthio)hexane . The dibrominated electron-withdrawing NDI (6, 7) and PDI (8) monomers were synthesized from methods published in the literature. , The Suzuki polycondensation between monomers 1 and 6, monomers 3 and 6, and monomers 1 and 8 resulted in the n-type polymers, PNE1, PNE2, and PPE1, respectively. The Stille polycondensation between monomers 5 and 7 produced an n-type polymer, PNE3.…”

Section: Resultsmentioning

confidence: 99%

All-Polymer Photodetectors with n-Type Polymers Having Nonconjugated Spacers for Dark Current Density Reduction

et al. 2022

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Recently, all-polymer-based p−n bulk heterojunction organic photodiodes exhibited a high photocurrent density (J ph ) through the state-of-the-art synthesis in n-type conjugated polymers. However, in the organic photodetector (OPD) application, the on−off ratio (J ph /dark current density (J d )) is a performance-determining parameter; thus herein we focused on effectively increasing the on−off ratio by lowering the J d of all-polymer OPDs. We developed four n-type polymers, with nonconjugated spacers, which effectively suppressed the J d of the devices; the increased insulating properties and excellent hole-blocking properties under dark conditions aided J d suppression. Moreover, breaking the π-conjugation of the n-type polymers, by adding short bulky nonconjugated spacers, effectively increased J ph and decreased J d in relation with those upon the addition of long flexible alkyl spacers. Hence, the OPDs based on the n-type polymer with a nonconjugated spacer exhibited a high specific detectivity of >10 12 Jones and a −3 dB cutoff frequency of 219 kHz. Notably, they also displayed ultrafast rising and falling response times of 2 and 9 μs, respectively, at −2 V.

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Section: Resultsmentioning

confidence: 99%

All-Polymer Photodetectors with n-Type Polymers Having Nonconjugated Spacers for Dark Current Density Reduction

et al. 2022

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“…The work successfully demonstrated that a small driving force can maximize the achievable efficiency of OSCs by reduction of V loss due to the non-radiative recombination processes, which will expand the potential possibilities of NFA-based OPV systems to lead toward a more practical technology. Although numerous examples of the bay-bridged dimeric PDIs have been explored so far [103][104][105][106][107][108][109][110][111][112][113][114][115][116][117][118][119], to the best of our knowledge, the above mentioned 3.2A/P3TEA system exhibited the highest performance due to the photovoltaic properties with the minimal voltage loss and the drastically enhanced J SC .…”

Section: Bay-bridged Dimeric Perylene Diimidesmentioning

confidence: 99%

Development of Perylene-Based Non-Fullerene Acceptors through Bay-Functionalization Strategy

et al. 2020

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Perylene has had a tremendous impact in the history of material research for the molecular semiconductors. Among numerous derivatives of this polyaromatic hydrocarbon, perylene diimide (PDI) represents a promising class of organic materials envisioned as non-fullerene acceptors (NFAs) for the practical organic photovoltaic (OPV) applications due to their enhanced photo- and thermal stability and remarkably high electron affinity, some of which realize band-like transport properties. The present review guides some of the representative achievements in the development of rationally designed PDI systems, highlighting synthetic methodologies based on bay-functionalization strategies for creating well-designed molecular nanostructures and structure-performance relationship of perylene-based small molecular acceptors (SMAs) for the photovoltaic outcomes.

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“…Although hydrofluoroalkane or fluorinated central core have been used to construct PDI acceptors [7b,d,e,12] . The fluorine atoms have rarely been introduced on PDI molecules because of the synthetic difficulty [12] .…”

Section: Introductionmentioning

confidence: 99%

Fluorinated Perylene Diimide Dimer for Organic Solar Cells as Non‐fullerene Acceptor

et al. 2021

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Fluorination has been widely applied in modification of photovoltaic materials, especially fused ring electron acceptors and polymer donors, but rarely in perylene diimides (PDIs)-based acceptors. The di-PDI-2F is facilely obtained by a one-step synthesis via stannylation/Stille crosscoupling reaction. Furtherly, we conducted a comparison study between the newly designed fluorinated PDI dimer di-PDI-2F and its non-fluorinated analogue di-PDI. After fluorination, the energy levels are downshifted, and the absorption spectrum is greatly blue shifted. When paired with a medium band-gap donor PM6, di-PDI-2F based organic solar cells show reduced trap-assisted and bimolecular recombination as well as better exciton dissociation and charge collection efficiency than that of di-PDI based ones, thus a greatly enhanced fill factor (FF), together with improved open circuit voltage (V oc ) and short circuit current density (J sc ), leading to a superior power conversion efficiency. This fact suggests the potential of fluorination strategy on PDI based acceptors.

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n-Type core effect on perylene diimide based acceptors for panchromatic fullerene-free organic solar cells

Cited by 13 publications

References 56 publications

All-Polymer Photodetectors with n-Type Polymers Having Nonconjugated Spacers for Dark Current Density Reduction

All-Polymer Photodetectors with n-Type Polymers Having Nonconjugated Spacers for Dark Current Density Reduction

Development of Perylene-Based Non-Fullerene Acceptors through Bay-Functionalization Strategy

Fluorinated Perylene Diimide Dimer for Organic Solar Cells as Non‐fullerene Acceptor

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